Friction-feed for drilling or boring machines



no Model.)

G.-S. WALKER. FRICTION-FEED FORDRILLING AND BORING momma.

Patented Nov. 27, 1888.

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UNITED STATES PATENT OFFICE,

GEORGE S. \VALKER, OF ELKLAND, PENNSYLVANIA.

FRICTION-FEED FOR DRILLING OR BORING MACHINES.

SPECIFICATION forming part of Letters Patent No. 393,674, datedNovember27, 1888.

Appicalion filed September 12, 1888. Serial No. 285.230. (No model.)

To all whom it may concern:

Be it known that I, GEORGE S. WALKER, of Elkland, in the county of Tiogaand State of Pennsylvania, have invented certain new and usefulImprovements in Friction-Feeds for Boring-Machines; and I do herebydeclare the following to be afull; clear, and exact descrip tion of theinvention,such as will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to an improvement in friction-feed for use withboring or drilling machines, and has for its object to produce a devicefor boring or other machines by which the feed of the bit may beregulated at will.

A further object is to furnish a boring or drilling machine with afriction-feed which shall be simple in construction and effective inoperation.

WVith these objects in view my invention .consists in certain novelfeatures of construction and peculiar combinations of parts, as will behereinafter set forth, and pointed out in the claims.

In the accompanying drawings, Figure 1 is an elevation of aboring-machine embodying my improved friction-feed. Fig. 2 is a view,partly in section, of a boring-machine, showing the clutch-plates inposition; Fig. 3 illustrates the clutch-plates detached.

For convenience of illustration I have shown the device applied to themachine for which application for Letters Patent was made by HarlinLongwell, December 22,1887, Serial No. 258,731, although it is evidentthat the improved feed mechanism is equally as applicable to boring ordrilling machines of different construction.

A indioatesa wooden upright secured so as to afford a support for theboring-machine.

B is the main frame of the machine, and is composed, essentially, of ametal bracket having lateral flanges a, which are extended from itssides to afford means for securing the frame to the upright timber A,The bracket B is further provided with two bosses, b b, which areperforated vertically and threaded to receive the hollow screw H. Thebosses b b are each constructed with a recess on one side, the edges ofthese recesses being undercut or dovetailed to afford boxes for theretention in place of the sliding plate I, which is thus held fromlateral displacement and permitted to have a vertical reciprocatingmotion, as will be further explained.

At the lower end of the bracket-plate I an arm,f, is attached orintegrally for|ned,which is perforated to receive the drill or hitspindle L, that is made of proper diameter to re tate in the feed-screwH, which latter is perforated axially or longitudinally to receive thedrill-spindle.

Upon the outside of the sliding bracketplate I, near its lower end, a.stud, g, is affixed, which projects at right angles from the face ofthis plate, and is intended to afford a revoluble support to the drivingbevel gearwheel D, this wheel having an elongated hub, D, that affords aproper bearing on the stud.

The drill-spindle L is diametrically enlarged to produce a shoulderimmediately below the perforated earfof the bracket-plate I, againstwhich this shoulder bears loosely, and upon this enlarged portion of thespindle a bevelpinion, E, is mounted and rigidly secured.

The bevel-pinion E is so relatively located that its teeth will meshwith the teeth of the driving gear-wheel D, and is provided with ahandle, J.

The lower end of the bitspiudle L is provided with a bit or drill-chuck,F, which may be of any approved form to secure the woodcutting anger ora metalcutting drill in axial line with the spindle, and upon the upperend of this spindleLa balance-wheel, G, is secured by a set-screw orother means, this wheel being of proper diameter and weight to affordsufficient momentum to the drill spindle to aid the operation of thedrill or anger when in use.

As the screw II is designed by its rotation to give the drill-spindle La regular downward motion or feed proportionate to the speed of rotationof this spindle, a provision is made to adj nstably secure the spindleand screw together and thus cause a rotation of the screw with thespindle.

To effect the connection of parts just mentioned and ali'ord anadjustable feed motion to the boring or drilling machine is the primaryobject of this invention, and will be now ex plained in'connection withthe form of drill above described.

The screw H is provided at its upper end with, preferably, dovetailedsockets 2 at diametrically opposite sides of the opening through saidscrew H for thereception of similarly-shaped flanges, 23, of twoclutching-plates 4 The clutch-plates 4 5arc advisably made ofcomparatively heavy spring-brass and of coneavo-convex form to conformto the contour of the drill-spindle L, which it is made to surround. Theside edges of these plates are beveled from the top downwardly andoutwardly, so that when placed in position the two plates will produce adivided conical collar, as shown, which closely hugs the drillspindle Lat the upper end of said plates.

The upper end of the screw II above the main threads is screwthreadcdfor the reception of the hollow hub 6 of an adjustingwheel, 7, said hubbeing screw threadedon the lower portion of its interior.

'The upper portion of the hub 6 is furnished with a conical opening, 8,adapted to conform to the shape of the outer surface of the conicalcollar produced by the plates 4 5.

It will be seen that by screwing the wheel 7 downwardly upon the hollowscrew H the conical opening in the hub will impinge upon the upperportions of the plates 4 5 and cause them to bind against or clutch thespindle L. and thus regulate the feed of the bit secured to the spindleL.

In operation the rotation of the spindle D by the handle J will transmita revoluble mo tion to the drillspindle through the bevelpinion E, andthe frictional contact established by the plates t 5 and wheel 7 willrevolve the screw II, so that a downward movement of the drill-spindleL, sliding bracket I, with the supported bevel gear-wheel D and pinionE, will thus be effected, and the anger or metal drill F be pressed intocontact with work placed on the table.

3y screwing the wheel 7 down upon the hollow screw H the clutch-plates 45 will be caused to more tightly bind against the drill spindle L andmake the connection between said spindle and the hollow screw morerigid, and thus increase the tension on the drill.

It may not be necessary in the use of the machine to drill small holesin hard metal to employ a positive and strong feed, and in that case theplates -t 5 may be relaxed by the wheel '7, so that a slow downwardmotion is given to the drill as compared to its rotary motion.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. In a friction-feed, the combination, with a hollow shaftand asolidshaft passing through the same, of a divided conical collar mounted inthe hollow shaft, and ahollow hub adapted to screw upon the hollow shaftand clamp the conical collar to the solid shaft, substantially as setforth.

2. In a friction-feed, the combination, with a hollow shaft and a solidshaft passing through the same, of two tapering curved clutch-platesmounted in the end of the hollow shaft to impinge against the solidshaft, and ahollow h nb adapted to screw upon the hollow shaft and clampthe clutch plates to the solid shaft, substantially as set forth.

3. In a friction-feed, the combination, with a hollow screw-shaft, of aboring machine and asolid shaft or spindle passing through the same, oftwo curved tapering clutch-plates mounted in one end of the hollowshaft, and a nut or hub adapted to screw upon the hollow screw-shaft,and having a conical opening to receive the clutch-plates, substantiallyas set forth.

1. In a friction-feed, the combination, with ahollow shaft and asolidshaft passing through the same, of a divided conical collar mounted inthe hollow shaft, and a wheel having ahnb adapted to screw upon thehollow shaft and clamp the conical collar to the solid shaft,substantially as set forth.

5. In a friction-feed, the combination, with a hollow shaft havingsockets in its upper end, and a solid shaft passing through said hollowshaft, of clutch-plates secured in the sockets of the hollow shaft andadapted to impinge against the solid shaft at their upper ends, and ahollow hub or nut adapted to screw upon the hollow shaft and clamp theclutch-plates to the solid shaft, substantially as set forth.

In testimony whereof I have signed this specification in the presence oftwo subscrib' ing witnesses.

GEORGE S. XVALKER.

Witnesses:

S. A. CAMPBELL, M. W. MILLER.

